Nail restrainer and a nailing machine equipped with said restrainer

ABSTRACT

An improved nail restrainer for a nailing machine comprises a nose located in the front of the nailing machine and a nose cover coupled with the nose. In the nose, there are formed a through hole allowing staples or straight nails to pass therethrough and a guiding groove allowing the staples or straight nails to slide therealong. An elastic rib is provided on the nose cover and extends into said guiding groove, one end of which is integral with the nose cover body. In the present invention, because of the integral structure between the elastic rib and nose cover, it is much easier to be manufactured, the bend extent of the elastic rib is easy to be controlled, and therefore the rejection rate is lowered. Moreover, as no assembling procedure for the elastic rib is needed, the cost is cut down.

FIELD OF THE INVENTION

The present invention relates to an improved nail restrainer and anailing machine equipped with said restrainer.

BACKGROUND OF THE INVENTION

In prior art, in order to get better performance to nail straight nailsand staples, most nailing machines are equipped with a nail restrainerfor restraining both straight nails and staples, so that the nailingmachines can work for different kinds of nails. In general, the nailrestrainer for the dual-purpose nailing machine comprises three separatecomponents, namely: nose cover, elastic rib and nose. The elastic rib isconnected to the nose cover through a connecting member. For instance,Chinese Utility Model patent No. 01270742.2 discloses a nail restrainerwhich comprises a nose and a separable nose cover which is locked ontothe nose. On the nose cover, there is an elastic rib, one end of whichis pivotally coupled to the nose cover. The elastic rib is placed in anail slot to restrain the nails. As the elastic rib is separable fromthe nose cover, there exist some shortcomings during production, suchas: it is difficult to control the bend extent of the elastic rib andthe rejection rate is very high. Moreover, it adds an extra step ofassembling the elastic rib.

SUMMARY OF THE INVENTION

The object of present invention is to overcome the disadvantages of theabove-mentioned prior art, and to provide an improved nail restrainerand a nailing machine equipped with such restrainer. This nailrestrainer is much easier to be manufactured and has a lower rejectionrate.

The nail restrainer according to the present invention comprises a noselocated in the front of the nailing machine and a nose cover coupledwith the nose. In the nose, there are a through hole allowing staples orstraight nails to pass therethrough and a guiding groove allowing thestaples or straight nails to slide therealong. An elastic rib isprovided on the nose cover and extends into the guiding groove, and oneend of the elastic rib is integral with the nose cover body.

As the elastic rib is integral with the nose cover, the nail restraineraccording to the present invention is easier to be manufactured, thebend extent of the rib is easier to be controlled, and therefore therejection rate is lowered. Moreover, as no assembling procedure for theelastic rib is needed in the present invention, the cost is cut down.

DESCRIPTION OF THE DRAWINGS

FIG. 1 is a schematic diagram of the nail restrainer for a nailingmachine in prior art.

FIG. 2 is a front view of the nose cover and elastic rib of the improvednail restrainer according to the present invention.

FIG. 3 is a cross sectional view along the line A-A of FIG. 2 showingthe nose cover and the rib.

FIG. 4 is a front view of the nose of the improved nail restraineraccording to the present invention.

FIG. 5 is an exploded view showing the improved nail restraineraccording to the present invention.

EMBODIMENTS

Referring to FIG. 1, a nail restrainer in prior art is illustrated,which comprises three separate components, namely: nose cover 1, elasticrib 2 and nose 3. There is a pivot hole 21 in one end of the elastic rib2 and this end of the elastic rib 2 is connected with the nose cover 1by an elastic cylindrical straight pin 22. On the other end of theelastic rib 2, there is a protruding part which extends into the guidinggroove of the nose 3. During manufacture, it is difficult to control thebend extent of the protruding part of the elastic rib 2 and therejection rate is very high.

Referring to FIGS. 2˜5, an improved nail restrainer according to thepresent invention comprises a nose 3 located in the front of the nailingmachine and a nose cover 4 coupled with the nose 3. Assembling of thenose 3 and a nailing machine is realized by conventional techniques, andtherefore is not described here. In the nose 3 there are formed athrough hole 31 allowing staples or straight nails to pass therethroughand a guiding groove 32 allowing the staples or straight nails to slidetherealong. An elastic rib 5 is provided on the nose cover 4 and extendsinto the guiding groove 32. Different from the prior art, in presentinvention one end of the elastic rib 5 is integral with the body of thenose cover 4.

Referring FIGS. 2 and 3, the structures of the nose cover 4 and theelastic rib 5 are illustrated. The elastic rib 5 is formed as a part ofthe nose cover 4. It is a tongue-shaped element of a constant width madethrough cutting and stamping processes. The elastic rib 5 inclinesgradually towards the guiding groove 32 from its connected end to itsfree end. A head of the free end is arc in shape and protrudes from thenose cover 4.

As shown in FIG. 4, the structure of the nose 3 is illustrated, in thenose 3 there is formed a guiding groove 32 allowing staples or straightnails to slide therealong. The through hole 31 is a U-shaped hole formedinside the groove 32, so that the staples can pass therethrough. On oneside of the U-shaped through hole there are a plurality of T-shapedthrough holes allowing straight nails of various models to passtherethrough.

As shown in FIG. 5, there are a plurality of through holes 43, 44 and 45in the nose cover 4 and there are a plurality of through holes 33, 34and 35 in the nose 3. The through holes 43, 44 and 45 correspond to theholes 33, 34 and 35 on a one-to-one basis. The nose cover 4 and the nose3 are fixed together by bolts which pass through the through holes 43,44 and 45 and the through holes 33, 34 and 35, such that the elastic rib5 extends into the guiding groove 32 and divides the width of the grooveinto two portions, on each side, the width shall at least be largeenough to allow straight nails or one side of staples to passtherethrough. On one side of the nose cover 4, there is formed arecessed portion 42 for facilitating installation of a safety stand. Asthe installation of the safety stand is of conventional technology, itis not described here.

As shown in FIGS. 2˜5, the function of the elastic rib 5 in the nailingmachine is as follows: When the nailing machine is not in operation, theelastic rib 5 always presses against the middle part of the guidinggroove 32 of the nose 3. While nailing straight nails, the nail feederfeeds straight nails into guiding groove 32 through one side of theelastic rib 5. In this case, the elastic rib serves as a directionalguide. While nailing staples, the nail feeder feeds staples into theguiding groove 32 through the staple slot. During the nailing operation,the striker pushes away the elastic rib 5 and drives out the staple orstraight nail. During this period, the elastic rib 5 remains pressingagainst the striker.

Apparently, those skilled in the art can use the improved nailrestrainer according to present invention to form various kinds ofnailing machines.

The above embodiment is used to explain the present invention only, andnot to limit the interpretation of this invention. It will be understoodby those skilled in the art that various changes in form and details arepossible without departing from the spirit and scope of the presentinvention as defined by claims.

1. An improved nail restrainer for a nailing machine comprising: a nose(3) located in the front of the nailing machine, in which there areformed a through hole (31) allowing stapes or straight nails to passtherethrough and a guiding groove (32) allowing said staples or straightnails to slide therealong; a nose cover (4) coupled with said nose; anelastic rib (5) provided on said nose cover (4) and extending into saidguiding groove (32); wherein one end of said elastic rib (5) is integralwith the body of said nose cover (4).
 2. An improved nail restrainer fora nailing machine according to claim 1, wherein said elastic rib (5) isa tongue-shaped element of a constant width.
 3. An improved nailrestrainer for a nailing machine according to claim 1, wherein saidelastic rib (5) inclines gradually towards said guiding groove (32) fromits connected end to its free end, and said free end protrudes from thebody of said nose cover (4).
 4. An improved nail restrainer for anailing machine according to claim 1, wherein a head of said free end ofsaid elastic rib (5) is arc in shape.
 5. An improved nail restrainer fora nailing machine according to claim 1, wherein there are a plurality ofthrough holes (43, 44 and 45) in said nose cover (4), and there are aplurality of through holes (33, 34 and 35) which correspond to saidthrough holes (43, 44 and 45) in said nose (3).
 6. An improved nailrestrainer for a nailing machine according to claim 1, wherein there isa recessed portion (42) formed at one side of said nose cover (4).
 7. Anailing machine having an improved nail restrainer, said nail restrainercomprising: a nose (3) located in the front of the nailing machine, inwhich there are formed a through hole (31) allowing staples or straightnails to pass therethrough and a guiding groove (32) allowing saidstaples or straight nails to slide therealong; a nose cover (4) coupledwith said nose; an elastic rib (5) provided on said nose cover (4) andextending into said guiding groove (32); wherein one end of said elasticrib (5) is integral with said nose cover (4).
 8. A nailing machineaccording to claim 7, wherein said elastic rib (5) is a tongue-shapedelement of a constant width.
 9. A nailing machine according to claim 7,wherein said elastic rib (5) inclines gradually towards said guidinggroove (32) from its connected end to its free end, and said free endprotrudes from said nose cover (4).
 10. A nailing machine according toclaim 7, wherein a head of said free end of said elastic rib (5) is arcin shape.
 11. A nailing machine according to claim 7, wherein there area plurality of through holes (43, 44 and 45) in said nose cover (4), andthere are a plurality of through holes (33, 34 and 35) which correspondto said through holes (43, 44 and 45) in said nose (3).
 12. A nailingmachine according to claim 7, wherein there is a recessed portion (42)formed at one side of said nose cover (4).